[Building Sakai] Errors sakai 2.8.0

[ciellie]

Hallo I'm getting this error on different tools, When I click on the tool on 
the left menu Here I clicked on  site info 

java.lang.NoClassDefFoundError: org/sakaiproject/util/ParameterParser
        at org.sakaiproject.vm.ComponentServlet.service
(ComponentServlet.java:50)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter
(ApplicationFilterChain.java:269)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter
(ApplicationFilterChain.java:188)
        at org.sakaiproject.util.RequestFilter.doFilter(RequestFilter.java:598)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter
(ApplicationFilterChain.java:215)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter
(ApplicationFilterChain.java:188)
        at org.apache.catalina.core.ApplicationDispatcher.invoke
(ApplicationDispatcher.java:691)
        at org.apache.catalina.core.ApplicationDispatcher.processRequest
(ApplicationDispatcher.java:469)
        at org.apache.catalina.core.ApplicationDispatcher.doForward
(ApplicationDispatcher.java:364)
        at org.apache.catalina.core.ApplicationDispatcher.forward
(ApplicationDispatcher.java:301)
        at org.sakaiproject.tool.impl.ActiveToolComponent$MyActiveTool.forward
(ActiveToolComponent.java:511)
        at org.sakaiproject.portal.charon.SkinnableCharonPortal.forwardTool
(SkinnableCharonPortal.java:1429)
        at org.sakaiproject.portal.charon.handlers.ToolHandler.doTool
(ToolHandler.java:204)
        at org.sakaiproject.portal.charon.handlers.ToolHandler.doGet
(ToolHandler.java:96)
        at org.sakaiproject.portal.charon.SkinnableCharonPortal.doGet
(SkinnableCharonPortal.java:862)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter
(ApplicationFilterChain.java:269)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter
(ApplicationFilterChain.java:188)
        at org.sakaiproject.util.RequestFilter.doFilter(RequestFilter.java:659)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter
(ApplicationFilterChain.java:215)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter
(ApplicationFilterChain.java:188)
        at org.apache.catalina.core.StandardWrapperValve.invoke
(StandardWrapperValve.java:210)
        at org.apache.catalina.core.StandardContextValve.invoke
(StandardContextValve.java:174)
        at org.apache.catalina.core.StandardHostValve.invoke
(StandardHostValve.java:127)
        at org.apache.catalina.valves.ErrorReportValve.invoke
(ErrorReportValve.java:117)
        at org.apache.catalina.core.StandardEngineValve.invoke
(StandardEngineValve.java:108)
        at org.apache.catalina.connector.CoyoteAdapter.service
(CoyoteAdapter.java:151)
        at org.apache.coyote.http11.Http11Processor.process
(Http11Processor.java:870)
        at 
org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConn
ection(Http11BaseProtocol.java:665)
        at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket
(PoolTcpEndpoint.java:528)
        at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt
(LeaderFollowerWorkerThread.java:81)
        at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run
(ThreadPool.java:685)
        at java.lang.Thread.run(Thread.java:662)
2011-07-07 14:25:34,248  WARN http-8080-Processor21 
org.sakaiproject.portal.util.ErrorReporter - Bug Report bug-id: 6e488cf5-fd89-
4235-a155-ea68fbcf95e5 user: 796b446a-1782-479c-b76a-cde82dca143d usage-
session: bb5d1a09-f091-4b63-9f2b-b89de077fa7f time: Jul 7, 2011 14:25:34 user 
comment: null stack trace
org.sakaiproject.portal.api.PortalHandlerException: 
org.sakaiproject.tool.api.ToolException: Servlet execution threw an exception
    at org.sakaiproject.portal.charon.SkinnableCharonPortal.doGet
(SkinnableCharonPortal.java:862)
caused by: org.sakaiproject.tool.api.ToolException: Servlet execution threw an 
exception
    at org.sakaiproject.portal.charon.SkinnableCharonPortal.forwardTool
(SkinnableCharonPortal.java:1429)
caused by: javax.servlet.ServletException: Servlet execution threw an exception
    at org.apache.catalina.core.ApplicationFilterChain.doFilter
(ApplicationFilterChain.java:188)
caused by: java.lang.NoClassDefFoundError: 
org/sakaiproject/util/ParameterParser
    at org.sakaiproject.vm.ComponentServlet.service(ComponentServlet.java:50)